Vietnam-Dien Bien Phu , Dominique D2 Hill, The Vietnamese name (C2), 06/May/1954 1954 Vietnamese troops.take Complete control of highest hill in the central position. D2 is really the only hill that can be clearly picked out from anywhere in the French lines. With D2 in Viet Minh hands the whole of the French central position was under direct observation and much of it within sniper range. Vietnamese workers installing 220 tonnes and 12.6m in height, largest monument on Hill D2 to commemorate the Dien Bien Phu Victory. ... .. . . .